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UPSC 2012: Electrically charged particles from space travelling at speeds of several hundred km/sec can severely harm living beings if they reach the surface of the Earth. What prevents them from reaching the surface of the Earth?
(a)The Earth's magnetic field diverts them towards its poles
(b)Ozone layer around the Earth reflects them back to outer space
(c)Moisture in the upper layers of atmosphere prevents them from reaching the surface of the Earth
(d)None of the statements (a), (b) and (c) given above is correct
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Not attemptedCorrect Answer: (a) The Earth's magnetic field diverts them towards its poles
The Earth’s magnetosphere acts like a giant shield: its magnetic field lines force incoming charged solar-wind/cosmic-ray particles to spiral toward the poles, preventing most of them from hitting the surface. The ozone layer blocks ultraviolet light, not charged particles, and atmospheric moisture offers no such protection. Hence, statement (a) alone explains the phenomenon. ([rishiupsc.com](https://rishiupsc.com/2012-prelims-question-paper-with-answers/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2012 Science & Technology question?▼
The correct answer is option (a): The Earth's magnetic field diverts them towards its poles. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Space Technology & Astronomy question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2012, GS Paper 1, as Question 20. It falls under Science & Technology > Space Technology & Astronomy.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Space Technology & Astronomy?▼
UPSC has asked 69 questions from Space Technology & Astronomy (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.